Ore stamping-mill and pulverizer



(No Model.) 2 Sheets-Sheet 1.

A. H. WOLFE & J. D. WEATHERBBE.

ORE STAMPING MILL AND PULVERIZER.

Patented Apr. 6, 1897.

THE was: Pzrzns co. vncvauwo wasnmcrou, n, c.

(No Model.) 2 SheetsSheet 2.

A. H. WOLFE 8: J. D. WEATHERBEB. ORE STAMPING MILL AND PULVERIZBR.

No. 580,029. Patented Apr. 6, 1897.

UNITE STATES PATENT OFFICE.

ALFRED HERMAN \VOLFE AND JOHN DUGLAS \VEATHERBEE, OF DENVER, COLORADO.

ORE STAMPING-MILL AND PU LVERIZER.

SPECIFICATION forming part of Letters Patent No. 580,029, dated April 6,1897'. Application filed December 7, 1895. Renewed September 3, 1896.Serial No. 604,811. (No model.)

'0 aZZ whom it may concern:

Be it known that we, ALFRED HERMAN WOLFE and JOHN DUGLAS WEATHERBEE,citizens of the United States of America, residingat Denver, in thecounty of Arapahoe and State of Colorado, have invented certain new anduseful Improvements in Ore Stam ping-Mills and Pulverizers; and we dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference beinghad to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

Our invention relates to improvements in ore stamping and pulverizingmills, and the objects of our invention are, first, to provide a mill inwhich the stamping and grinding stems are given a sliding movement overthe dies; second, to provide means for screening the pulp and forcontinually conveying that portion of the ore which is not stamped fineenough to pass through the meshes of the screen back again to thefeed-inlet of the mortar in order that it may be stamped to the requiredfineness; third, to provide means for adjusting the stems and shoes inrelation to the dies; fourth, to provide an adjustable feeding device;fifth, to provide a rotary screening device; sixth, to provide aresilient adjustable connection between the stems and their drivingelements. Ve attain these objects by the mechanism illustrated anddescribed in the accompanying drawings and specification, in whichFigure 1 represents a side elevation of the stamp-mill in sectionthrough the mortar on line A of Fig. 2, but showing the stamping andgrinding stem of that section of the mortar in elevation. Fig. 2represents a front elevation of one half of the mill and a section ofthe opposite half on line D of Fig. 1. Fig. 3 represents a fragmentarysectional plan view of a part of the shaft-box and one side of frame online B of Fig. 1 of one of the standards. Fig. 4 representsacontinuation, on a smaller scale, of the lower terminal of the orechutefrom the screens and the elevator employed to convey the coarse-stampedore discharged from the mortar back to the feedinlets of the mortar.Fig. 5 represents a fragmentary cross-section of one of the stems,

its driving-crank, and its box on line O of Fig. 1. Fig. 6 represents afragment of the mortar in perspective, showinga perspective view of oneof the adjustable feed-gates of the feed-inlet. Fig. 7 representsafragment of the mortarin perspective, showing the ap- 6o plication of acommon rectangular screen to it instead of the rotary screen illustratedin Fig. 1.

Similar letters and figures of reference refer to similar partsthroughout the several views.

Referring to Fig. 1, D designates the mortar. It has a base-flange E anda top flange F, which are connected by ribs E. The mortar, asillustrated, is adapted for one set of two stamping and grinding stems,which would be the lowest number of stems used in a machine. Mortarsadapted for a battery of sets of stems would be made longer. The mortaris divided into two compartments D and D by a transverse partition G,which separates the crushing end of the stems from one another. In thebottom of each compartment is a recess H, in which a die I is looselyseated. This die is constructed of very hard metal, preferably hardenedsteel. On one side of the mortar there is an orcfeed inlet J, leadinginto each compartment of the mortar to the dies. A gate K, which is madeof boiler-iron, is secured to the side of the mortar (see Fig. 6) bycleats L, which are secured to the mortar by bolts or rivets. The gateis raised or lowered to increase or diminish the feed of the ore bymanually turning a screw M, which is provided with a hand-wheel N and issupported by a bracket 0. The screw is threaded to a lug P, which isriveted to the gate. On the opposite side of the mortar from thefeed-inlets a dischargeoutlet for each compartment is made. This 5discharge-opening p p is made circular, and around each opening isarranged a rotary screen which is adapted to receive upon its innersurface the discharge of the mill.

The screens comprise two metal rings Q IOC and Q, with a wirecylindrical screen R secured on their innersurfaces. The rings rest onrollers or wheels S and T. These rollers are loosely mounted on shaftsU, which are j ournaled in brackets V. These brackets are bolted to themortar. The ring Q is adapted to receive a belt W, by which it isrotated. This belt connects it with pulley X, which is secured rigidlyto a counter-shaft X at right angles to the axis of the screen. Thiscounfer-shaft is supported by a bracket Z, which is bolted to the topflange of the mortar. Be side the pulley X and secured rigidly to thesame shaft is a second pulley 1,which is driven by a belt 2 from a splitpulley 3, which is clamped to the main driving-shaft at of thestamp-mill, from which power is transmitted to the screens through thebelts and pulleys just described.

In Fig. 1 the screen shown in section and the chute 5 is the screen ofthe compartment D of the mortar shown in section in Fig 2' and also thechute of that screen. The belt XV (shown in Fig. 1) and also thebrackets Z and pulleys X and 1 and 3 and the belt 2 are these respectiveparts illustrated in the elevation part of mill in Fig. 2. The screen ofeach mortar-compartment D is driven' by a system of pulleys and beltsexactly like that above described from a split pulley X X, onehalf ofwhich is shown on the shaft 4 in a position similar to that occupied bythe pulley 3. By this arrangement each screen is 1:0- tated independentof the other, and if when a battery of several sets is used one stem hasto be cut out from accident for a time none of the others are interferedwith.

The screens discharge the ore not stamped fine enough to pass throughtheir meshes into a chute 5, which is supported by arms II from thebrackets V. The chute is constructed to convey the ore from each screenby independent passages V and V to a central passage V placed centrallybetween the two compartments of the mortar, which conveys it under it tothe boot 7 of the belt-elevator 9, which is properly housedand'journaled at each end in a framework 10 and is provided with buckets11. The top of the elevator is supported by a bracket 12, which isbolted to the under side of the top flange of the mortar. This bracketsupports the top shaft 13 of the elevator-belt. A pulley 14: is securedto this shaft. It is belted to a pulley 15, which is secured to acounter-shaft 16. The countershaft is journaled in a bracket S S, whichis bolted to the mortar. A second pulley Y is secured to this shaft 16,which is driven by a belt 17 from a splitpulley 18, which is clamped tothe driving-shaft 4. The elevator is placed centrally between thefeed-inlets of the mortar. From the top of the elevator dischargespouts19 and 20 diverge in opposite directions to the feed-inlets anddischarge into them, as shown in Fig. 6 and indicated by dotted lines inFig. 2.

21 and 22 and R R are standards. They are securely bolted by bolts23 tothe top flange of the mortar at its opposite ends. The stand ards areconnected together near the top by adj ustable threaded rods 24, whichare adapted to prevent them from springing either away from or towardone another. The standards are adapted to support the detachable boxes25 and 26 in vertical alinement on transverse portions 27, which have anopening through the standards above them and around the sides and topsof the boxes. Between the sides of the boxes and the sides of opening inthe standards in which they are placed wedges 28 are inserted to key theboxes against slipping laterally on their bolts 20. The boxes arepositioned on the standards to support the crank-shafts a and 30parallel with one another and in a vertical plane and also centrallyover the longitudinal center of the mortar. The cranks 31 and 32 of eachshaft are of the same throw and are set to move in unison and to alwaysoccupy parallel planes as they rotate, and the two cranks of each shaftare set at diametrical opposite points from the shafts center. The lowershaft is the driver or main shaft of the mill. It is driven by a beltconnecting one of the fly-wheels 33 with some source of power. Thefly-wheels are keyed to the shaft 'by keys 34. The upper shaft is drivenby a belt 35 from the pulley 36, which is keyed to main shaft at andwhich connects with the pulley 37,keyed to shaft 30.

38 and 39 design ate the stamping and grinding stems of the mill. Theyare cast or malleable iron or steel castings. They are divided into twoparts at 40, where they are securely bolted together. The upper part isin the form of a yoke and contains a slideway, which is arranged tostraddle the boxes 41 and pass between flanges on opposite sides ofthem, as shown in Fig. 5, which is a fragmentary plan view on line C ofFig. 1. The yoke portion is closed at the top, and the slideway extendsto below the main shafts crank-boxes to make a space for the expansivespring 42 between the box-cap and the bottom of the opening in the yoke.spring rests 011 a stud 43, which is threaded into the stem. The springrests around a projection formed on the head of the stud. A projectionis also cast on the cap of the box. They operate to hold the spring inposition. The stud is adapted to adjust the resilience of the spring asthe shoes at the lower ends of the stems wear away and the stems settle.

down. This adjustment is necessary, as the boxes are free to move in theopening in the yokes of the stem and do not move down with the stems asthe shoes wear, and as the shoes wear the distance between the bottom ofthe opening in the yokes and the caps of the lower crank-boxes isincreased. At the top of the stems a handscrew 44 extends through thestem and bears on the cap of the top box. A check-nut 45 is used to lockthe screw in its adjusted position, and an expansible spring 46 isplaced around the screw between the cap and the nut or stem to relievethe upward thrust of the boxes on their upward throw The lower end ofthe against the screw. The base or body of both upper and lower boxes isa continuous bar of metal 47, in which one half of the bearing of eachcrank is journaled, the bar and caps forming a pitman. The caps aresecured to the base-bar by bolts 48, which are inserted through thebase-piece into the lower cap.

The shoes i9 are chilled castings or steelhardened forgings and aredetachably secured to the stems by means of a taper projection 50, whichfits into a taper-hole 51 in the end of the stems. A keyway 52 is formedtransversely through the stems, in which a key is inserted to drive theshoe off. The face or bottom of the shoe and also the face of the dieare made straight across both ways, but the face of the die and shoeinclines downward from the feed-inlet side of the mortar toward thedischarge, the floor of the mortar being cast on an incline in orderthat the die can be of even thickness, or nearly so, even if the angleof the die should be changed considerably. The angle of the die shouldbe varied when treating ores of different degrees of hardness to obtainthe best results. Thus the dies for some ores could be made of greaterangle, as indicated by the dotted lines 5-), but for extremely soft rockthe face of the dies could be curved concentric with the center of themain shaft,as shown by the dotted line 5t. same pitch and form as thedies.

The operation is as follows: Power being transmitted by belt to one ofthe fly-wheels, the main crank-shaft is rotated in the direction of thearrow 55, and consequently the auxiliary or upper shaft, which is beltedto it and is also rigidly connected to it by the crank-boxes. The cranksof the two shafts, being of the same throw and being connected to rotatetogether in planes parallel to one another, hold the stems always in avertical position, but move them in a true circle except where theycontact with the downwardinclined dies shown in Fig. 1, where they slidedown the dies until the cranks lift them on their upward movement. InFig. 1 but one stem is shown in order to avoid confusion, but thecorrect position of the opposite stem in relation to the one shown isillustrated by a fragment of its lower end in dotted lines. \Yhen thecranks come over on their downward movement, the shoes are impingedagainst the face of the die or upon the ore that is fed through thefeed-inlet upon them, as the velocity given the cranks is much greaterthan the velocity of the natural drop of the stems would be if fallingthrough a distance equal to the throw-of the cranks. Aheavyblowisstruck. The minute the shoe strikes the ore on the die the stem and shoecommence to slide down the die, being drawn down by the cranks as theyrotate. The cranks as they rotate after a shoe strikes a die slide thepitman down in the stems, which compresses the springs 4.2 until thecranks pass their lower centers, when they move the pit- The faces ofthe shoes must be of the man upward against the spring 46 at the top,which receives the first upward shock, and then against the hand-screw44. Then the stems are lifted from the die and carried up and over. Asthe stems and shoes slide down the dies the ore is ground and pulverizedbetween them in addition to being stamped by violent impingement of theshoes as they come down on the dies, and as it accumulates it works outand is assisted out by the movement of the stem onto the rotary screens,which are of about forty-mesh. Particles of ore larger than the resttravel through the screens and drop into the chutes and are returned bythe elevator to the dies to be further diminuated by the shoes, whilethe screenings are collected and conveyed away or are allowed to droponto amalgamating-tables, over which they are carried by water.

The arrangement of the cranks at opposite points from one another allowsthe weight of one stem to balance the weight of the opposite one andenables them to rotate smoothly and without severe shock to the shafts.As the shoes wear, the hand-wheel, its nut, and the lower stud of eachstem can be adjusted to keep the boxes and springs in proper operativerelation. This stamp-mill is adapted for either wet or dry stamping.\Vhen used as a wet stamp, a stream of water is kept flowing into themortar, but it is better adapted, as illustrated, for dry stamping.

Having described our invention, what we claim as new, and desire tosecure by Letters Patent, is

1. In a combined stamp and pulverizing mill the combination with themortar, of the standards, and crank-shafts journaled therein having aplurality of sets of cranks with each crank of each shaft diametricallyopposed to the one adjacent to it, said shafts journaled in saidstandards in vertical alinement, one above the other and theirlike-disposed cranks arranged to register in vertical alinement witheach other, stamping-stems pivotally connected to a crank of each shaftand extending into the mortar in operative relation thereto, means forrotating the lower shaft, and means for driving the upper shaft from thelower and for rotating its cranks in unison and in planes parallel withthe cranks of the lower shaft whereby the said stems are held invertical position and are reciprocatcd in the mortar by a rotarymovement, substantial] y as described.

2. The combination with the mortar, the standards, the crank-shafts andthe stems, of the pitman adapted to connect the like-disposed eranks ofthe shafts together, the springs above and below said pitman, theadjustment for the said springs, a hardened removable die in the floorof said mortar having a beveled impactsurface, and a hardened detachableshoe on the lower end of said stems having its impact-surface beveled toregister with the die.

3. The combination of the mortar having a partition dividing it intocompartments, the feed-inlet, the adjustable feed-gate, thedischarge-outlet, the rotary screens, means for rotating said screensubstantially as described, the chute, the elevator, the standards, themain crank-shaft, the fly-wheels, means for rotating said shaft, theauxiliary shaft, the pitman connecting said crankshafts, the stemshaving a slideway and adjustable yielding driving connections with saidcranks, substantially as described.

4E. The combination of the mortar having divided compartments andinclined dies in the floor of said compartments having a beveled orconcave surface concentric to the main driving-shaft, the feed-inlet,the adjustable feed-gate therein, the circular discharge-outlet, therotary screen, the rollers, the belts and pulleys operating saidscreens, the chute, the elevator, the standards, the crank-shafts, thefly-wheels, means for rotating both shafts in unison, the pitmanconnecting the cranks of the shafts together and slidably confined in aslidewayin the stems, a resilient adj ustable connection between saidpitman and said stem at each end, an adjustable abutment at the upperend of said pitman and detachable hardened shoes on the ends of saidstems registering with the surface of the dies.

5. The combination with the mortar and the standards, of twocrank-shafts journaled one over the other in vertical alinement havingtwo oppositely-arranged cranks on each shaft of equal throw and adaptedto register vertically with one another in horizontal planes radiatingfrom each shafts respective center, fly-wheels on the main shaft, meansfor rotating said main shaft, belt connection between the two shaftswhereby the upper or auxiliary shaft is rotated by the main shaft,stamp-stems journaled to the same disposed and alined cranks of bothshafts in suitable boxes adapted to slide vertically in said stems,resilient abutments above and below said journal-boxes secured to saidStems, and means for adjusting the upward movement of said boxesrelatively to the stamping-surfaces of the stems, substantially asdescribed.

(3. The combination in a stamp-mill of a mortar having a feed-inlet anddischarge-outlet, a hardened die therein inclined downward from the feedside toward the discharge-outlet side of said mortar, standards securedto said mortar, two cranks arranged vertically one above the other inboxes detachably secured to said standards, a set of two or a pluralityof sets of two oppositely-arranged cranks on each shaft in verticalalinement, fly-wheels on the lower or main shaft adapted for beltconnection with a source of power, belt connection between said lowerand upper shafts whereby theyare rotated together in unison, stamp-stemsin said mortar, aslideway in said stems, a pitman journaled to alike-disposed crank of each shaft and adapted to move freely verticallyin said slideway, an

expansive spring at each end of said slideway ALFRED HERMAN WOLFE. JOHNDUGLAS WEA'IIIERBEE.

Witnesses:

NEWARK L. BURTON, JOHN W. HELBIG.

